Alex Waygood 3950b00ee4 [red-knot] Implement disjointness for Instance types where the underlying class is @final (#15539) ... ## Summary Closes https://github.com/astral-sh/ruff/issues/15508 For any two instance types `T` and `S`, we know they are disjoint if either `T` is final and `T` is not a subclass of `S` or `S` is final and `S` is not a subclass of `T`. Correspondingly, for any two types `type[T]` and `S` where `S` is an instance type, `type[T]` can be said to be disjoint from `S` if `S` is disjoint from `U`, where `U` is the type that represents all instances of `T`'s metaclass. And a heterogeneous tuple type can be said to be disjoint from an instance type if the instance type is disjoint from `tuple` (a type representing all instances of the `tuple` class at runtime). ## Test Plan - A new mdtest added. Most of our `is_disjoint_from()` tests are not written as mdtests just yet, but it's pretty hard to test some of these edge cases from a Rust unit test! - Ran `QUICKCHECK_TESTS=1000000 cargo test --release -p red_knot_python_semantic -- --ignored types::property_tests::stable` --------- Co-authored-by: Carl Meyer <carl@astral.sh>		2025-01-16 23:48:52 +00:00
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resources	[red-knot] Implement disjointness for Instance types where the underlying class is @final (#15539)	2025-01-16 23:48:52 +00:00
src	[red-knot] Implement disjointness for Instance types where the underlying class is @final (#15539)	2025-01-16 23:48:52 +00:00
tests	mdtest: include test name in printed rerun command (#14684)	2024-11-30 11:01:06 +00:00
build.rs	Modernize build scripts (#13837)	2024-10-20 22:35:35 +01:00
Cargo.toml	type: ignore[codes] and knot: ignore (#15078)	2024-12-23 10:52:43 +01:00